TypeScript: is there a way to programatically construct an interface using an enum

Question

So I have an enum defined as this

enum EventType {
  JOB,
  JOB_EXECUTION,
  JOB_GROUP
}

And I need to create an interface like this

interface EventConfigurations {
  JOB: {
    Enabled?: boolean;
  };

  JOB_EXECUTION: {
    Enabled?: boolean;
  };

  JOB_GROUP: {
    Enabled?: boolean;
  };
}

Given there is a one to one mapping existing between them, I wonder if there is a way to generate this interface based on the enum ? Currently I just hardcoded it

Answer 1

You can create it as a type (not an interface) like this:

type EventConfigurations = Record<keyof typeof EventType, { Enabled?: boolean }>

Explanation:

• Using typeof on an enum gives a type with each of its string members as keys and numbers as values.
• Using keyof on that type gives a union type containing each of those keys.
• Record<K, V> is a mapping from type K to type V .

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